7320777561 has 24 divisors (see below), whose sum is σ = 10873611840. Its totient is φ = 4742771616.

The previous prime is 7320777559. The next prime is 7320777589. The reversal of 7320777561 is 1657770237.

It is not a de Polignac number, because 7320777561 - 2¹ = 7320777559 is a prime.

It is a super-2 number, since 2×7320777561² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (7320777511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 266286 + ... + 292488.

It is an arithmetic number, because the mean of its divisors is an integer number (453067160).

Almost surely, 2^7320777561 is an apocalyptic number.

It is an amenable number.

7320777561 is a deficient number, since it is larger than the sum of its proper divisors (3552834279).

7320777561 is a wasteful number, since it uses less digits than its factorization.

7320777561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27085 (or 27082 counting only the distinct ones).

The product of its (nonzero) digits is 432180, while the sum is 45.

The square root of 7320777561 is about 85561.5425351834. The cubic root of 7320777561 is about 1941.7161242398.

The spelling of 7320777561 in words is "seven billion, three hundred twenty million, seven hundred seventy-seven thousand, five hundred sixty-one".